题目内容
下面各题怎样简便就怎样计算。
(1)
÷
×
(2)4×0.8×2.5×1.25
(3)
-
-
+
(4)
×[
-(
-
)]
(1)
(3)
(1)
÷
×
=
×
×
=(
×
)×
=
(2)4×0.8×2.5×1.25
=4×2.5×(0.8×1.25) =10
(3)
-
-
+
=
-(
+
)+
=
(4)
×[
-(
-
)]
=
×[
-
]
=
×
=
=
=(
(2)4×0.8×2.5×1.25
=4×2.5×(0.8×1.25) =10
(3)
=
(4)
=
=
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